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Efficient photonic reformatting of celestial light for diffraction-limited spectroscopy


Reference:

MacLachlan, D. G., Harris, R. J., Gris-Sánchez, I., Morris, T. J., Choudhury, D., Gendron, E., Basden, A. G., Spaleniak, I., Arriola, A., Birks, T. A., Allington-Smith, J. R. and Thomson, R. R., 2017. Efficient photonic reformatting of celestial light for diffraction-limited spectroscopy. Monthly Notices of the Royal Astronomical Society, 464 (4), pp. 4950-4957.

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    Official URL:

    https://doi.org/10.1093/mnras/stw2558

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    Abstract

    The spectral resolution of a dispersive astronomical spectrograph is limited by the trade-off between throughput and the width of the entrance slit. Photonic guided wave transitions have been proposed as a route to bypass this trade-off, by enabling the efficient reformatting of incoherent seeing-limited light collected by the telescope into a linear array of single modes: a pseudo-slit which is highly multimode in one axis but diffraction-limited in the dispersion axis of the spectrograph. It is anticipated that the size of a single-object spectrograph fed with light in this manner would be essentially independent of the telescope aperture size. A further anticipated benefit is that such spectrographs would be free of 'modal noise', a phenomenon that occurs in high-resolution multimode fibre-fed spectrographs due to the coherent nature of the telescope point spread function (PSF). We seek to address these aspects by integrating a multicore fibre photonic lantern with an ultrafast laser inscribed three-dimensional waveguide interconnect to spatially reformat the modes within the PSF into a diffraction-limited pseudo-slit. Using the CANARY adaptive optics (AO) demonstrator on the William Herschel Telescope, and 1530 ± 80 nm stellar light, the device exhibits a transmission of 47-53 per cent depending upon the mode of AO correction applied.We also show the advantage of using AO to couple light into such a device by sampling only the core of the CANARY PSF. This result underscores the possibility that a fully optimized guided-wave device can be used with AO to provide efficient spectroscopy at high spectral resolution.

    Details

    Item Type Articles
    CreatorsMacLachlan, D. G., Harris, R. J., Gris-Sánchez, I., Morris, T. J., Choudhury, D., Gendron, E., Basden, A. G., Spaleniak, I., Arriola, A., Birks, T. A., Allington-Smith, J. R. and Thomson, R. R.
    DOI10.1093/mnras/stw2558
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    URLURL Type
    http://www.scopus.com/inward/record.url?scp=85014847959&partnerID=8YFLogxKUNSPECIFIED
    Uncontrolled Keywordsinstrumentation: adaptive optics,instrumentation: spectrographs,astronomy and astrophysics,space and planetary science
    DepartmentsFaculty of Engineering & Design > Architecture & Civil Engineering
    Faculty of Science > Physics
    Research CentresCentre for Photonics and Photonic Materials
    ?? WIRC ??
    Publisher Statementstw2558.pdf: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
    RefereedYes
    StatusPublished
    ID Code55102

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